Fire-alarm



'(No Model.) Y 4 J. EBARL-E'S.

FIRE ALARM.- No. 351,753 Patented Nov. 2, 1886.

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f UNITED STATI-is PATENT* OFFICE.

JOHNV H. Exams, or DENVER, COLORADO.

*FIRE-ALARM.

SPECIFICATION forming part of Letters Patent No. 351,753, dated November 2, 1886.

-Aptucmion med Aprile-1, 18st.

To all whom ibm/ay concern.

Beit known that I, JOHNH. EARLEs, a citizen of the United States, residing at Denver,

Y in the county of Arapahoe and State of Coloin Figs. 2 and 3 is operated.

rado, have invented a new and useful Improvement in Fire-Alarms, of which the following is a specification, reference being had therein to the accompanying drawings, in whichsimilar letters refer to corresponding parts. A

Myinvention .relates to improvements in lire-alarms; and the object of my improvements is to provide an automatic Bre-alarm for use in dwelling-houses, hotels, businessblocks, 8vo. i

Figure 1 is a view of the mechanism by means of which-the alarm'mechanism shown Fig. 2 is a side view, and Fig. 3 an end View, of the alarm mechanism. Fig. 4 shows an attachment by means of which the alarm is soundedfrom different iioors of the same building. Fig. 5 shows the piston forming part of the mecha-nism shown in Fig. l.

In the drawings, c is a receptacle containing mercury, mounted upon a suitable support attached to the wall of the room.

b is a piston working 'within the tubular or upper portion of receptacle a. The top part of piston b contains holes b', andis attached to alever, c, by means of a pin, as shown. 'Ihe object of holes b is to regulate the depth to which piston b penetrates tube a. Lever c has a fulcrum, c', and is connected with `another lever, d, having a fulcrum, d. The inner extremities of levers c and d are so beveled that when-both levers are in a horizontal position, or in a position nearly horizontal, the inner extremities will be in contact and both levers will remain at rest until the outer extremity of lever c is raised sufficiently to disconnect the two levers. The outer extremity of lever d is so fashioned that a weight,e, may be hung thereon when said lever is in a horizontal position.

f is a case which guides the direction of weight e as it falls after being released from lever d.

g and h are levers connected by means of a notch in lever g, one extremity of lever'h being fashioned to fit within said notch. Said levers remain in contact until the outer ex- Serial No. 200,114. (No model.)

` tremity of lever g .is depressed sufficiently to disconnect them, as shown. These levers are 'provided with fulcru ms g' and h.

other extremity of said wire being attached to a pawl, 7c, provided with pivot 7c.

Z is a shaft jourualed within a suitable supporting-frame, and provided with cog-wheel m and ratchet-wheel n, which are made fast to the same and turn with it. "Pawl k engages ratchet-wheel n.'

-o is ashaft journaled within a supportingframe, and provided with small cog-wheel p and escapement-wheel r, which are made fast thereon and turn with it. Vheel p meshes within wheel m. l

s is an escapement, provided with hammer s2 and working upon a shaft, s. Escapement s is operated by wheel r. 15 is a gong, against which hammer sistrikes.

u is a weight attached to rope o, which is wound around a drum formed by the enlargement of shaft Z between itsjournals.

In describing the operation of myimproved device, I will designate the mechanism shown in Fig. l as'the motor andthe mechanism shown in Figs. 2 and 8 as the alarnn7 The'motor is fastened to a suitable frame attached to the wall of the room. The alarm may be at any distance therefrom within the same building, the two being connected by the wire iwhich is provided with guide-pulleys or other supports, j', placed at suitable distances. A button, ji, is placed upon wire j, so as kto come in Contact with one of the supports, leaving the wire slack between it and weight when suspended on lever h. Button jz prevents wire j from being drawn tight by any force acting between it and the alarm.

-Piston b may be set by the use of thermom eter tv,- so as to sound the alarm-gong at any desired temperature. Thus, reckoning that piston b must be raised fteendegrees in order to disconnect levers c and d, we adjust the piston so that its lower extremity shall remain at a point, as indicated by the thermometer, 15 below the temperature at which we desire the gong to sound.

In describing the operation of my improved alarm, Iwill suppose that a re originates in the room where the motor is placed. As the temperature of the room increases the mercury rises in tube a, and lifts piston b, thereby dis` connectingleverscandcl. Weightethendrops upon lever g, thus releasing lever h, which permits weight i to drop, said weight being heavy enough to disconnect pawl 7c and ratchet-wheel n. W'eight u then sets shaft l in motion, which operates the alarm mechanism, causing hammer s2 to beat gong t.

One of my motors should be placed in a central position on each 'lo'or of the building. Only one alarm necd be used, the same being -placed in that portion of the building where it will be most readily heard.

A wire leading from the motors placed upon the different floors of the building is attached to a ring, .'v, to which the Wire connected with pawl k is also attached. Ring x is so placed within the room containing the alarm that it may be readily observed. rIhe wires y are attached to ring .r.

To each wire y is attached a covering, y', placed over a figure, denoting the number of the fioor where the motor is located with which said wire is connected.

A fire having started in the vicinity of the motor located on any particular floor, the wire y, connected with the motor on said iioor, is pulled sufficiently to sound the alarm and at the same time to remove the covering y from the ligure indicating the number of the iioor where the iire has originated.

7hat I claim as my invention, and desire to secure by Letters Patent, is-

1. In a fire-alarm, the combination of receptacle a, containing mercury, said receptacle being provided with a neck, a', piston b, fashioncd to work within neck a', lever c, provided with fulcrum c' and attached to piston b, as

shown, lever d, provided with fulcrum d and connected with lever c, as shown, weight e, hung upon lever c, lever g, provided with fulcrum gand notch g, the outer extremity of said lever being placed directly beneath weight e, lever 11 provided with fulcrum h and connected with lever g, as shown, weight i, hung upon leverlz, and wire j, attached to weight'i at one extremity, the other extremity being connected with suitable mechanism for sounding the alarm, substantially as described.

2. In a tire-alarm, the combination of a inotor consisting of a receptacle, a, containing mercury and provided with a neck or tube, ai', piston b, fashioned to fit within said neck a', and provided with holes b in its upper portion, lever c, provided with 'fulcrum c, and attached to piston b, as shown, lever d, provided with fulcrum d', and connected with lever c, as shown, weight e, hung upon lever d, lever y, provided .with fulcrum g and notch 9"', its outerarm bei ng placed directly beneath weight e, lever h, provided with fulcrum h', and connected with lever g, as shown, weight yi, hung upon lever h, and an alarm consisting of pawl lr, to which is attached one extremity of wire j, as shown, ratchet-wheel n, connected with pawl 7c and working upon shaft l, gear-wheels m and 1), working upon shafts Z and o, respectively, escapenient-wheel r, working upon shaft o, andescapement s, connected with said wheel r andworking upon shaft s', said escapement being provided with hammer sz and gong t, substantially as described, and for the purpose set forth.

JOHN H. EARLES.

In presence of- J. B. WiLLsnA, F. l. WILLsnA. 

